Internal refactoring. If we have a toMap, a toList makes sense (which is already needed internally).

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1560003 13f79535-47bb-0310-9956-ffa450edef68
Javadoc: use the active voice.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1560005 13f79535-47bb-0310-9956-ffa450edef68